Window mounted air conditioning unit



R. E. C. HARTMAN ET Al- WINDOW MOUNTED AIR CONDITIONING UNIT Sept. 13, 1955 Filed Jan. 1l, 1952 EIMM INVENTORS. @jeff ZT #arf/W4 United States Patent O WINDOW MOUNTED AER CONDITIONING UNIT Robert E. C. Hartman, Dayton, and Richard W. Gilmer, Lewisburg, Ohio, assignors to Chrysler Corporation, Highland Park, Mich., a corporation of Delaware Application January 11, 1952, Serial No. 265,998

3 Claims. (Cl. 62-129) This invention relates to self contained air conditioning units of the window mounted type, and more particularly, to air conditioning units provided with improved fresh air inlet and room pump out features.

It is a principal object of our invention to provide an air conditioning unit which is capable of admitting fresh air to its evaporator compartment for cooling and simultaneously withdrawing air from the room and discharging it to the atmosphere.

It is a further object of the invention to provide an air conditioning unit having means to selectively exclude all recirculated room air from the evaporator coil so that the unit may be operated entirely on fresh air.

it is an additional object of the invention to provide an air conditioning unit having a passage to accommodate the discharge of air from the room to the outside and to use a damper to isolate this air from air in the evaporator compartment in such a manner that the damper also serves as a bafe to direct air to the condenser compartment for room pump out.

It is also an object of the invention to provide means for accomplishing the aforementioned objects in an air conditioning unit having a single motor for driving both an evaporator fan and a condenser fan.

ln the drawings:

Fig. l is a side elevation of an air conditioning unit embodying our invention; and

Fig. 2 is a horizontal section taken on the line 2-2 of Fig. l.

In Fig. l of the drawings the air conditioning unit which is indicated generally by the numeral is illustrated as mounted in a conventional window opening. The unit is supported upon the inside window sill 12 and the outside window sill 14 and the window sash 16 is received in a recess 18 in the top of the unit thereby permitting a greater area of window glass to be exposed.

The air conditioning unit includes a generally rectangular casing 20 having a transversely extending partition 22 which divides the casing into an evaporator compare ment 24 and a condenser compartment 26 which are located inside and outside the room respectively. An r evaporator 28 is mounted within the casing and located in the evaporator compartment in parallel relationship to the partition 22. A condenser 30 is mounted in the casing in the condenser compartment 26 and extends parallel to the partition 22. A compressor 32 is also mounted in the condenser compartment 26 and connected in refrigerant iiow relationship with the evaporator 28 and the condenser 30 in a conventional manner.

A propeller type fan 34 mounted on shaft 36 of a motor 38 is placed in the condenser compartment 26 rearwardly of condenser 30 and serves to draw exterior air through openings 40, 42 and 44, which are provided in the side walls of the casing 20, and to pass such air through the condenser 30 for discharge to the outside atmosphere through a discharge opening 46 provided in the rear wall of the casing. A propeller type fan 48 which is also mounted on the shaft 36 is placed in comice partment 24 inwardly of the evaporator 28 to force air from the evaporator compartment 24 through the evaporator to condition the same prior to its discharge to the room from a discharge opening 50. The shaft 36 is normal to the condenser 30 and evaporator 28.

Openings 52 and 54 are provided in the opposite side walls of casing 2t) for the admission of room air to the evaporator compartment 24 and a pair of partitions 55 and 57 each extend across the evaporator compartment 24 from a position adjacent one end of the evaporator to the partition 22. The partitions 55 and 57 extend from the bottom to the top of casing 20 and are provided with openings 59 and 61 respectively. The opening 59 is provided with a filter 56 and the opening 61 is provided with a filter Sil so that air admitted to the evaporator from opening 52 is filtered by filter 56 and air admitted to the evaporator from opening 54 is filtered by ilter 58. it is desirable to include in the above described air conditioning unit means for the admission of fresh outside air for conditioning by the evaporator 28 and to reduce the amount of room air that is passed through the evaporator by a corresponding amount. To accomplish this the partition 22 is provided with an opening 60 and lducting 62 connects partition 22 to a side wall of the casing so that an opening 64 in the side wall which is exposed to the atmosphere externally of the room is connected in fluid tiow relationship with opening 60 by a path that is isolated from the air in the condenser compartment 26. A damper 66 is pivotally mounted at 68 and may be moved to a irst position, illustrated in solid lines in Fig. 2, in which the opening 60 is obstructed and the opening 52 is unobstructed to accommodate the admission of room air to the evaporator compartment 24. The damper 66 may be moved about its pivotal mounting 68 to a second position illustrated in broken lines in Fig. 2 and in this latter position the damper obstructs the opening 52 thereby preventing the admission of room air to the evaporator compartment 24 through opening 52, but accommodating the admission of fresh outside air to the evaporator compartment through openings 64 and 60. The damper 66 may, of course, assume any intermediate position and a mixture of fresh outside air and room air will be admitted to compartment 24. A control shaft 70 which may be provided with a knob (not shown) is pivotally mounted in the casing 20 and provided with a crank arm 71 which engages a slot 73 in damper 66 to facilitate control of the damper 66 by the operator.

Means are also provided in the air conditioning unit for the discharge of room air to the condenser cornpartment 26 and, under the inuence of fan 34, to the atmosphere exteriorly of the room through opening 46 in casing 20. This s commonly referred to as room pump out and to accomplish this the partition 22 is provided with an opening 72 and a damper 74 is pivotally mounted at 76 for movement between a iirst position which is illustrated in solid lines in Fig. 2 and in which the opening 72 is blocked to a second position illustrated in broken lines in Fig. 2. When the damper 74 is in its rst position, as illustrated in solid lines in Fig. 2, room air is admitted through opening 54 to the evaporator compartment 24 and it passes through the filter 58 and the evaporator 28 under the influence of fan 48. However, when the damper 74 is in its second position, which is illustrated in broken lines in Fig. 2, the iilter 58 is completely blocked so that opening 54 is isolated from fan 4S, but in iiuid flow communication with condenser compartment 26 through opening 72. The condenser fan 34 then serves to induce a ow of air through opening 54, and opening 72 into the condenser compartment 26 for discharge to the outside through opening 46. The damper 74, when in its second position, serves as a bale to direct air from opening 54 toward the opening 72 for room pump out as described above.

The damper 74 is slotted at 80 to receive a crank arm 82 of a control shaft 84 which is pivotally mounted in the casing 20 and has a knob 86 by means of which the operator may move the damper 74 about its pivotal mounting 76.

In the operation of the air conditioning unit, it will be seen that with dampers 74 and 66 in the positions illustrated in solid lines in Fig. 2 the openings 72 and 60 are blocked and the air conditioning unit operates in a conventional manner with room air being admitted to the evaporator compartment through openings 52 and 54 for discharge by fan 48 through evaporator 28 and outlet opening 50. If the damper 74 is moved to the position illustrated in Fig. 2 by broken lines the filter 58 is blocked and if, at that time, the damper 66 is in the position illustrated in broken lines in Fig. 2 the opening 52 is blocked so that no room air can be admitted to the evaporator compartment from opening 52 or a 54. However, under these conditions the opening 60 in partition 22 is unobstructed and fresh air from the outside of the building is drawn through openings 64 and 60 to the evaporator compartment 24 by fan 48 for discharge through the evaporator 28 and outlet opening 50. Thus only fresh outside air is conditioned and discharged to the room outlet opening 50.

With the dampers in the broken line position discussed in the preceding paragraph a pump out of room air is also obtained by the flow of air to the condenser compartment 26 through opening 54 and opening 72 for discharge to the outside through opening 46 under the infiuence of fan 34.

Room pump out may also be obtained with the damper 74 in its broken line position in Fig. 2 While the damper 66 is in its solid line position in Fig. 2. Under these conditions recirculated room air is admitted to the evaporator compartment 24 through opening 52 while air is being discharged from the room by condenser fan 34 which is drawing air through openings 54 and 72 for discharge through opening 46.

A mixture of fresh air and recirculated room air may be admitted to the evaporator compartment 24 by operating the unit with the damper 66 in the broken line position of Fig. 2 and the damper 74 in the solid line position of Fig. 2. Under these conditions the admission of fresh air is accommodated by openings 64 and 60 while recirculated room air which is drawn into the evaporator cornpartment through opening 54, is filtered by filter 58.

We claim:

l. An air conditioning unit comprising a substantially rectangular casing adapted to be positioned in a window of a room to be conditioned, said casing having top, bottom, front, rear and first and second side walls, partition means extending transversely of said casing and intersecting said first and second side walls, said partition dividing said casing into a front evaporator compartment and a rear condenser compartment, said evaporator compartment having an inlet opening for the admission of recirculated room air in each of said first and second side walls adjacent said partition and said condenser compartment having inlet openings in said side walls for the admission of fresh outside air, said evaporator compartment being provided with an outlet opening in said front wall for discharge of air to the room and said condenser compartment being provided with an outlet opening in said rear wall for discharge of air to the outside, said first side wall being provided with a fresh air inlet opening on the condenser side of said partition, said partition having an opening adjacent said first side wall, means including a duct defining a passage isolated from the air in said condenser compartment and extending between said fresh air inlet opening and the opening in said partition for the admission of fresh outside air to the evaporator compartment, a damper pivotally mounted on said casing adjacent the intersection of said partition and said first wall for movement between a first position in which it blocks said fresh outside air passage and a second position in which it opens said passage and blocks the recirculated air inlet opening in said first side wall, said partition having a second opening therein, a second damper mounted on said casing for movement between a first position in which it blocks said second opening and a second position in which said second opening is open and said second damper baffles room air from the recirculated air inlet opening in said second side wall of the casing to said second opening in said partition for room pump out, an air propelling device in said evaporator compartment operable to induce a fiow of air from said evaporator compartment through said evaporator compartment outlet opening in said casing front wall, and an air propelling device in said condenser compartment operable to induce a flow of air from said condenser compartment through said condenser compartment outlet opening in said casing rear wall.

2. An air conditioning unit comprising a substantially rectangular casing adapted to be positioned in a window of a room to be conditioned, said casing having top, bottom, front, rear and first and second side walls, partition means extending transversely of said casing and intersecting said first and second side walls, said partition dividing said casing into a front evaporator compartment and a rear condenser compartment, said evaporator compartment having an inlet opening for the admission of recirculated room air in each of said first and second side walls adjacent said partition and said condenser compartment having inlet openings for the admission of fresh outside air, said evaporator compartment being provided with an outlet opening in said front wall for discharge of air to the room and said condenser compartment being provided with an outlet opening in said rear wall for discharge of air to the outside, said first side wall being provided with a fresh air inlet opening on the condenser side of said partition, said partition having an opening adjacent said first side wall, means including a duct defining a passage isolated from the air in said condenser compartment and extending between said fresh air inlet opening and the opening in said partition for the admission of fresh outside air to the evaporator compartment, a damper pivotally mounted on said casing adjacent the intersection of said partition and said first wall for movement between a first position in which it blocks said fresh outside air passage and a second position in which it opens said passage and blocks the recirculated air inlet opening in said first side wall, said partition having a second opening therein, and a second damper mounted on said casing for movement between a first position in which it blocks said second opening and a second position in which said second opening is open and said second damper divides said evaporator compartment into first and second isolated portions with said second opening and the inlet opening in said second side wall communicating with the first of said evaporator compartment portions to provide a substantially straight line fluid ow communication with said condenser compartment for room air to accommodate room pump out and with said passage and the evaporator compartment inlet opening in said first side wall provided with paths for communicating with said evaporator compartment outlet opening through the second evaporator compartment portion.

3. An air conditioning unit comprising a casing having top, bottom, front, rear and rst and second side walls adapted to be positioned in a window of a room to be conditioned, partition means extending transversely of said casing and engaging said top, bottom and first and second side walls to divide said casing into an evaporator compartment and a condenser compartment, an evaporator positioned in said evaporator compartment and eX- tending along the front wall of said casing, each of said casing first and second side walls being provided with an air inlet opening between said partition means and said evaporator, said casing also deiining an air outlet opening in the front wall of said casing and on the other side of said evaporator, a first propeller typefan rotatably mounted in said evaporator compartment with its axis normal to said evaporator and adapted to create a circulation of air in said evaporator compartment from said inlet openings, through said evaporator and out said outlet opening, a condenser located in said condenser compartment and extending along the rear wall of said casing, each of said casing side walls in the region of said condenser compartment having an air inlet therein, said casing also having an air outlet in said rear wall which communicates with the outside atmosphere, a second propeller type fan rotatably mounted in said condenser compartment with its axis normal to said condenser and adapted to create a circulation of outside air through some of said last mentioned air inlets, over said condenser and out the outlet opening in said rear wall, said partition having first and second openings therein adjacent said rst and second side Walls, respectively, means forming a duct connecting said iirst opening in said partition with an air inlet opening in the first side Wall of said condenser compartment, a first damper mounted in said casing for movement between a rst position in which it blocks said first opening in said partition and a second position in which it opens said last mentioned opening and blocks the air inlet opening to said evaporator compartment in said casing first side Wall so that fresh outside air is drawn by said first fan through said duct and propelled through said evaporator for cooling and discharge through the outlet opening in the front wall of said casing and into said room, a second damper mounted in said casing for movement between a first position in which it blocks said second opening in said partition and a second position in which it opens said second opening in said partition and isolates the air inlet opening in said second side wall from said evaporator and said first propeller type fan whereby with said second damper in its second position a pump out of room air to the outside is effected by said second propeller type fan while said first damper is in its first position and recirculated room air is admitted to said evaporator compartment or, in the alternative, while said first damper is in its second position and fresh outside air is admitted to said evaporator compartment through said duct.

References Cited in the file of this patent UNITED STATES PATENTS 2,283,928 Huggins May 26, 1942 2,290,973 Jewell July 28, 1942 2,317,104 MOOre Apr. 20, 1943 2,343,122 Eberhart Feb. 29, 1944 2,401,560 Graham June 4, 1946 2,472,792 Cohler .Tune 14, 1949 2,488,589 Eberhart Nov. 22, 1949 

